Bed-motion for printing-presses.



H. 'HARTT. BED MOTION FOR PRINTING PRESSES.

Patented Jan. 8, l90l.

(Application filed Oct. 13, 189 9.)

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No. 665,525. Patented lah. a, I90l.

H. HAR TT. BED MOTION FOR PRINTING PRESSES.

(Application filed Oct.' 13, 18:59. (No Model.)

4 Sheets-Sheet 2.

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No. 665,525. Patented lama, mm,

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(Application flledpct. 13, 1899.)

4 Sheets-Sheet 3.

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Patented Ian. 8, l90l. H. HARTT. BED MOTION FOR PRINTING PBESSES.

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HENRY I-IARTT, OF CHICAGO, ILLINOIS.

BED-MOTION FOR PRlNTlNG-PRESSES.

SPECIFICATION forming part of Letters Tatent No. 665,525, dated January 8, 1901.

Application filed October 13. 1899. Serial No. 733,481. .110 model.)

To ctZZ whom it may concern:

Be it known that I, HENRY HARTT, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Bed-Motions for Printing-Presses, of which the following is a specification.

My invention relates to the bed-motions for printing-presses, and has for its object certain improvements in the driving mechanism therefor.

In the accompanying drawings, Figure 1 is a sectional elevation. Fig. 2 is a plan with the framework in horizontal section. Fig. 3 is an elevation in the direction 3 of Fig. 1, showing the racks and reversing devices. Figs. 4 and 5 are details showing the position of the reversing devices at the end of the rack-strokes and at the beginning of the reversing actions. Fig. 6 shows the position of the same parts at the extreme of one reciprocation, the gear and cam being at onequarter revolution beyond the position shown in Fig. 4. Fig. 7 is a section on line 7 7 of Fig. 2, and Fig. 8 is a section on line 8 8 of Fig. 7.

In the said drawings,10 represents the frame of a printing-press, upon which there is reciprocated a bed 11. Secured to the bed 11 is a frame 12, which is provided with parallel racks 13 and 14, that face toward each other, but are laterally removed from each other, so that a gear meshing in one rack will just clear the other. The lengths of these racks arej ust equal to the circumference of a gear whose diameter is the vertical distance between the pitch-lines of the racks. The lengths may, however, be any multiple of that circumference. Mounted in suitable bearings 15 in the frame 10 is a sleeve 16, one end of which is provided with a cylindrical chamber 17, having the slots 18. Running through the sleeve 16 is a shaft 19, on the inner end of which is secured the hub of a gear 20, the arms of which pass through and fit in the slots 18. The hub of the gear 20 is therefore within the chamber 17, while the gear itself is external thereto and driven by contact between the edges of the slot 18 and the arms of the gear. The length of these slots permits the gear 20 to be moved axially with respect to the chamber 17 a distance equal to the lateral displacement of the racks 13 and 14 with respect to each other. The point of driving contact between the chamber 1'7 and the arms of the gear20 being widely removed from the center there is less strain and less danger of looseness than when the driving is by means of a feather. Near the outer end of the shaft 19 is a loose collar 21, which is axially adjustable on said shaft by means ofthe set-collars 22. A forked lever 23, which embraces the collar 21 and is operated by a cam 24, serves as a means for shifting the gear 20 alternately to engagement with racks 13 and 14. A train of gearing connecting to both the sleeve 16 and the cam 24 causes this shifting to occur just after the racks have been moved, so that their endscoincide with the center of the gear 20.

The open end of the chamber 17 is closed by a removable plate 25, on the face of which is a cam 26. At each end of the rack-frame 12 is a bracket 27, to which are secured the rollers 28. The rollers 28 are so located with respect to the ends of the racks l3 and 14 and the cam 26 is so located with respect to the motion of the gear 20 that when the end of a driven rack reaches the center of said gear the end of the cam 26 is just beginning to enter the space between the rollers 28, located at that end. Preferably the cam 26 has a form that will reverse the motion of the bed within the radius of the gear 20 and with a motion equivalent to that of a crank having a pitman of infinite length.

With the bed in mid-position and the motions in the directions shown by the arrows in Fig. 3 the gear 20 will be in mesh with the upper rack 13 and the cam 26 will lie above the center. A half-revolution will carry the rack-frame and the cam 26 to the position shown in Fig. 4, at which point the rack-driving action ceases and the cam enters the space between the rollers 28 and commences the retardation of the rack-frame, (bed) The retardation continues through one-quarter revolution when the position is that shown in Fig. 6. During the next one-quarter revolution the bed (rack-frame) is being accelerated by the cam 26 in the opposite direction up to the speed of the pitch-line of the gear 20. During these two one-quarter revolutions the ends of the racks 13 and 14 are moved to the right beyond the line of engagement with the gear 20, and while they are thus moved the cam 24 a'cts to shift the gear 20 to the left, as seen in Fig. 1, into line with the lower rack 14. At the end of the two one-quarter revolutions the racks are again in the positions shown in Fig. 4, but the cam 28 is above the center. A further complete revolution of the gear 20 brings the parts to the positions shown in Fig. 5, when the same reversing and shifting actions are repeated at the other end.

What I claim is- 1. In a printing-press, a sleeve terminating in an enlarged chamber having slots in its periphery, a gear surrounding said chamber and connected to a hub within said chamber by arms passing through said slots, a shaft passing through said sleeve and secured to the hub of said gear, and means for moving said shaft axially so as to shift said gear with respect to said chamber.

2. In a printing-press, the combination with a bed provided with racks by which it is reciprocated and rollers by which the motion is reversed, of a cam for engaging said rollers, a sleeve terminating in an enlarged chamber to the shell of which said cam is secured, a shaft passing through said sleeve and having one end within said chamber, a gear surrounding said chamber and connected to said shaft by arms passing through slots in the shell of said chamber, and means for shifting said gear with respect to said chamber.

3. In the bed-moving devices of a printingpress, the combination with a cylindrical chamber one head of which is formed by a removable cam-carrying plate and the other head of which terminates in a hollow sleeve communicating with the interior, of a gear surrounding said chamber and connected to a hub in the interior by arms passing through slots in the cylindrical walls of said chamber, and a shaft connected to the hub of said gear and passing out through said sleeve for the purpose of giving said gear an axial movement with respect to said chamber.

Signed by meat Chicago, Illinois, this 10th day of October, 1899.

HENRY HARTT.

Witnesses:

RHODA E. SMALE, C. L. REDFIELD. 

